Vehicle Semiconductor Switch Layout for Accurate Voltage Sensing
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Solution Overview
Problem
Existing vehicle-mounted semiconductor switch devices face issues with delayed current blocking due to the influence of counter electromotive force caused by the inductance component of the path when detecting voltage between electrodes.
Innovation Solution
A vehicle-mounted semiconductor switch device with a semiconductor switch and a voltage detection unit, where the conductor portion is bonded to the conductive path and the lead portion is bonded to the voltage detection path, allowing for accurate voltage detection while minimizing the impact of counter electromotive force, enabling quicker switching to the OFF state when abnormal voltages are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage detection is performed using a lead portion electrically connected to an electrode, then voltage between electrodes can be detected, but counter electromotive force caused by path inductance affects detection accuracy and delays current blocking
Solution Approach 1:
The patent divides the electrical connection structure into separate functional segments: the conductor portion is bonded to the first conductive path for current flow, while the lead portion is bonded to the first voltage detection path for voltage sensing. This segmentation allows the current path and detection path to be electrically separated, preventing counter electromotive force from affecting voltage detection accuracy and enabling timely current blocking.
Solution Approach 2:
The patent introduces an intermediary structure where the lead portion serves as a dedicated voltage detection path rather than being part of the high-current conductive path. This intermediary configuration allows voltage to be sensed without the lead portion being subjected to large current changes, thereby eliminating counter electromotive force interference and enabling accurate voltage detection for timely protection.
2Device complexity
If the same lead portion is used for both current conduction and voltage detection, then device structure is simplified, but voltage detection is affected by counter electromotive force from path inductance
Solution Approach 1:
The patent segments the electrical connection into distinct functional portions: the conductor portion handles current conduction by being bonded to the first conductive path, while the lead portion handles voltage detection by being bonded to the first voltage detection path. This segmentation maintains relatively simple device structure while eliminating the interference of counter electromotive force on voltage detection accuracy.
Solution Approach 2:
The patent applies local quality differentiation where the conductor portion is optimized for current conduction (bonded to conductive path) and the lead portion is optimized for voltage detection (bonded to detection path). This local functional differentiation ensures that voltage detection is performed in a region not subjected to high current changes, thereby maintaining detection accuracy without significantly increasing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses the influence of counter electromotive force, allowing for reliable detection of voltages between electrodes and rapid switching to the OFF state when abnormal conditions occur, thereby preventing potential overcurrents.
Implementation Method 1
a counter electromotive force Ls·di/dt based on an inductance component Ls of the path and a temporal change di/dt of the current i is generated in the path between the detection position and the electrode
Data Source
AI summary
A vehicle-mounted semiconductor switch device includes a semiconductor switch that is controlled by an ON signal and an OFF signal output from an vehicle-mounted drive circuit and that is switched between an ON state and an OFF state between a first conductive path and a second conductive path. The vehicle-mounted semiconductor switch device further includes a voltage detection unit. The semiconductor switch includes a first lead portion electrically connected to the first electrode, and a conductor portion electrically connected to the first electrode. One of the conductor portion and the first lead portion is bonded to the first conductive path, and the other is bonded to a first voltage detection path. A voltage detection unit detects a voltage applied to the first voltage detection path.